Preserve empty JSON schema metadata (#1488)

Author: biefan

pyrit/models/json_response_config.py

@@ -42,7 +42,7 @@ def from_metadata(cls, *, metadata: Optional[dict[str, Any]]) -> _JsonResponseCo
             return cls(enabled=False)
 
         schema_val = metadata.get(_METADATAKEYS["JSON_SCHEMA"])
-        if schema_val:
+        if schema_val is not None:
             if isinstance(schema_val, str):
                 try:
                     schema = json.loads(schema_val) if schema_val else None

tests/unit/models/test_json_response_config.py

@@ -55,6 +55,18 @@ def test_with_json_schema_object():
     assert config.strict is True
 
 
+def test_with_empty_json_schema_object():
+    metadata = {
+        "response_format": "json",
+        "json_schema": {},
+    }
+    config = _JsonResponseConfig.from_metadata(metadata=metadata)
+    assert config.enabled is True
+    assert config.schema == {}
+    assert config.schema_name == "CustomSchema"
+    assert config.strict is True
+
+
 def test_with_invalid_json_schema_string():
     metadata = {
         "response_format": "json",